将数据从Activity传递到Fragments

Question

我已经完成了一个简单的应用程序,通过json列出mysql数据库中的所有产品.当我点击特定产品时,它会将我带到显示其详细信息的活动.现在我更改了我的应用程序,以便当我从列表中单击特定产品时,它将转到3个选项卡式片段.我创建了所有相关的片段,一切正常.当我尝试将数据从列表中的所有产品活动传递到详细信息片段活动时,它才起作用.如何将主屏幕中列出所有产品的数据传递给显示详细信息的3个片段？

进一步说明:

没有框架的工作示例:主要活动显示所有产品,并在选择单个产品时将其传递给详细信息活动 - >详细信息活动从主要活动获取数据并显示详细信息

现在我有显示所有产品的主要活动.我是否将数据传递给 - >"公共类EmpresaDetailsActivity extends FragmentActivity实现ActionBar.TabListener {etc"还是我必须将它传递给我创建的所有其他3个单个片段？

(旧方式)列出所有产品:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.all_empresas);

        empresaList = new ArrayList<HashMap<String, String>>();

        // Get listview
        ListView lv = getListView();

        // on selecting single empresa
        // launching Empresa Details Screen
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                // getting values from selected ListItem
                String eid = ((TextView) view.findViewById(R.id.eid)).getText().toString();
                String marca = ((TextView) view.findViewById(R.id.marca)).getText().toString();
                String investimento = ((TextView) view.findViewById(R.id.investimento)).getText().toString();
                String marcatotal = ((TextView) view.findViewById(R.id.marcatotal)).getText().toString();

                // Starting new intent
                Intent in = new Intent(getApplicationContext(),EmpresaDetailsActivity.class);
                // sending data to next activity
                in.putExtra(TAG_EID, eid);
                in.putExtra(TAG_MARCA, marca);
                in.putExtra(TAG_INVESTIMENTO, investimento);
                in.putExtra(TAG_MARCATOTAL, marcatotal);

                // starting new activity and expecting some response back
                startActivity(in);
            }
        });

        // Loading empresa in Background Thread
        new LoadAllEmpresa().execute();
    }

(旧方式)单个产品的详细信息:

public class EmpresaDetailsActivity  extends Activity {

    // JSON node keys
    private static final String TAG_EID = "eid";
    private static final String TAG_MARCA = "marca";
    private static final String TAG_INVESTIMENTO = "investimento";
    private static final String TAG_MARCATOTAL = "marcatotal";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.details_empresa);

        // getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String eid = in.getStringExtra(TAG_EID);
        String marca = in.getStringExtra(TAG_MARCA);
        String investimento = in.getStringExtra(TAG_INVESTIMENTO);
        String marcatotal = in.getStringExtra(TAG_MARCATOTAL);

        // Displaying all values on the screen
        TextView lblEid = (TextView) findViewById(R.id.showEid);
        TextView lblName = (TextView) findViewById(R.id.showMarca);
        TextView lblInvestimento = (TextView) findViewById(R.id.showInvestimento);
        TextView lblMarcatotal = (TextView) findViewById(R.id.showMarcaTotal);

        lblEid.setText(eid);
        lblName.setText(marca);
        lblInvestimento.setText(investimento);
        lblMarcatotal.setText(marcatotal);
    }
}

具有3个片段的New Details类:

public class EmpresaDetailsActivity extends FragmentActivity implements ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = { "Apresentação", "Ficha Técnica", "Pedir Informação" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.details_global_frag);

        // Initilization
        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Adding Tabs
        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name)
                    .setTabListener(this));
        }

        /**
         * on swiping the viewpager make respective tab selected
         * */
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }

}

TabsPagerAdapter类:

public class TabsPagerAdapter extends FragmentPagerAdapter {

    public TabsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int index) {

        switch (index) {
        case 0:
            // Top Rated fragment activity
            return new ApresentacaoFragment();
        case 1:
            // Games fragment activity
            return new FichaTecnicaFragment();
        case 2:
            // Movies fragment activity
            return new PedirInformacaoFragment();
        }

        return null;
    }

    @Override
    public int getCount() {
        // get item count - equal to number of tabs
        return 3;
    }

}

3个片段中的1个的示例:

public class ApresentacaoFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_apresentacao, container, false);

        return rootView;
    }
}

Answer 1

在启动片段之前,在onItemClick()上执行活动:

Bundle args = new Bundle();
args.putString(TAG_EID, eid);
args.putString(TAG_MARCA, marca);
args.putString(TAG_INVESTIMENTO, invetstimento);
args.putString(TAG_MARCATOTLA, marcatotal);
yourFragment.setArguments(args);

在您的片段OnCreateView()上:

Bundle args = getArguments();
String marca = args.getString(TAG_MARCA);
// and so on...

更清楚的是,您应该如何在Activities/Fragments之间传递数据.

• 活动 - >片段:使用Bundle和setArguments.(如上图所示)
• 活动 - >活动:使用Intent和putExtra.
• 片段 - >活动:使用界面.Avtivity应该实现它,Fragment应该调用它.

检查新代码后:

1. 将您的字符串包装在Bundle中并将其从MainActivity传递到EmpresaDetailsActivity.
2. 使用getIntent().getExtras()获取它.

3. 将TabsPagerAdapter更改为:

   public class TabsPagerAdapter extends FragmentPagerAdapter {
   
   private Bundle args;
   
   public TabsPagerAdapter(FragmentManager fm, Bundle args) {
       super(fm);
       this.args = args;
   }
   
   @Override
   public Fragment getItem(int index) {
   
   switch (index) {
   case 0:
       // Top Rated fragment activity
       ApresentacaoFragment apresentacaoFragment = new ApresentacaoFragment();
       apresentacaoFragment.setArguments(args);
       return apresentacaoFragment;
   case 1:
       // Games fragment activity
       // do the same as above with your Games fragmnet class
   case 2:
       // Movies fragment activity
       // ...
   }
   
   return null;
    }
   
    @Override
   public int getCount() {
       // get item count - equal to number of tabs
       return 3;
   }   
   }
   

   4. 实例化适配器时,将包传递给其构造函数.
   5. 在你的片段类中,使用getArguments()来获取包,然后你就完成了.